"We want it to be a real, real challenge for people," said senior gameplay designer Andreas Ojerfors. "This is not an easy game."

The game's secret modes follow through on that promise. They give a considerable bump to the game's difficulty. They'll spice up a second or third play-through of the campaign. Maybe some masochists will use these modes for their first go at the game, though.

The new modes will be unlocked by entering the enigma codes in the game's menu. Here are the codes along with descriptions of the new modes they introduce:

999 Mode

What it does: B.J. Blazkowitz gets unlimited ammo and grenades. His health is also overcharged to 999. However, you're also playing on Uber difficulty.

Enigma Code:
01-02-03-04-05-06-07-08-09
08-07-06-05-04-03-02-01-09

Hardcore Mode

What it does: This code removes all of the health and armor pickups from the game. Also, it sets the difficulty to Uber. Hope you like dying.

Enigma Code:
03-06-09-03-06-09-03-06-09
06-03-09-06-03-09-06-03-09

Ironman Mode

What it does: "Uber difficulty is too damn easy," says no one. However, if you're one of the few people looking for a bigger challenge, Ironman Mode is your jam. It's Uber difficulty with permadeath. In other words, you have only one life to beat the whole campaign.

Enigma Code:
04-08-03-07-02-06-01-05-09
05-01-06-02-07-03-08-04-09

Walk In The Park Mode

What it does: Compared to the other modes on this list, Walk in the Park isn't that bad. It's not easy, though. This mode is set at I Am Death Incarnate difficulty, a notch below Uber. It also removes all the HUD elements from your screen to add some guesswork to your journey.

Enigma Code:
02-04-06-08-01-03-05-07-09
07-05-03-01-08-06-04-02-09

Wolfenstein: The New Order launched May 20th on Xbox One, PS4, PC, Xbox 360 and PS3. Check out how the game looks on PS4 and Xbox One by reading checking out this side-by-side analysis.